21 research outputs found

    Recent Results on Charm Photoproduction

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    Photoproduction of Ds±D_s^{\pm} mesons has been measured in the ZEUS detector at HERA and compared with predictions of NLO pQCD calculations. The ratio of Ds±D_s^{*\pm} to D±D^{*\pm} cross sections has been compared to results from e+ee^{+}e^{-} experiments. Orbitally excited P-wave charm mesons have been observed in the D±πD^{*\pm}\pi^{\mp} final state. The fraction of D±D^{*\pm} 's originating from these mesons has been calculated and compared with that from e+ee^{+}e^{-} interactions. No evidence for radially excited mesons decaying to D±π+πD^{*\pm}\pi^{+}\pi^{-} was found. The inelastic production of J/ψ\psi mesons has been measured and compared to LO and NLO pQCD predictions.Comment: 7 pages, 4 figures, Talk given at the PHOTON 2000 Conference, Ambleside, UK, August 26-31,200

    Bioenergy and climate change mitigation: an assessment

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    Acknowledgements The authors are indebted to Julia Römer for assisting with editing several hundred references. Helmut Haberl gratefully acknowledges funding by the Austrian Academy of Sciences (Global Change Programme), the Austrian Ministry of Science and Research (BMWF, proVision programme) as well as by the EU-FP7 project VOLANTE. Carmenza Robledo-Abad received financial support from the Swiss State Secretariat for Economic Affairs.Peer reviewedPostprin

    Preparedness of the CTSA's Structural and Scientific Assets to Support the Mission of the National Center for Advancing Translational Sciences (NCATS)

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    The formation of the National Center for Advancing Translational Sciences (NCATS) brings new promise for moving basic and discoveries to clinical practice, ultimately improving the health of the nation. The CTSA sites, now housed with NCATS, are organized and prepared to support in this endeavor. The CTSAs provide a foundation for capitalizing on such promise through provision of a disease-agnostic infrastructure devoted to C&T science, maintenance of training programs designed for C&T investigators of the future, by incentivizing institutional reorganization and by cultivating institutional support

    Search for effective Lorentz and CPT violation using ZEUS data

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    Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS e±p data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events corresponding to an integrated HERA luminosity of 372 pb-1 at s=318 GeV has been performed. No evidence for oscillations in sidereal time has been observed within statistical and systematic uncertainties. Constraints, most for the first time, are placed on 42 coefficients parametrizing dominant CPT-even dimension-four and CPT-odd dimension-five spin-independent modifications to the propagation and interaction of light quarks
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